You are absolutely right to point out that a party is not a movement. The voters are so used to thinking in terms of the two-party system that they feel anyone so foolish as to vote for a candidite outside the sacred two is either a traitor or (their favorite epithet) an idiot. I have even read suggestions by frustrated voters that if we must have a third party that it should rise out of political moderates as it might then attract spporters of both traditional parties. When did anything innovative ever rise come from an unimaginative "moderate?"
Somehow out of all the disappointment and disillusionment of members of both parties who are insightful enough to see that our very survival as a nation depends on breaking the old mold and striking off in bold new directions to accommodate the needs of a 21st Century democracy, a genuine movement may arise. That, at least is my hope. Voters delude themslves into thinking change is even possible when the two parties claim different priorities but actually offer the same realities. What is so desperately needed in leaders today is that "vision thing." That's what fires up a movement.